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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '961ba5c340edb24651e981c89554fa7d33792bfbf26307c186fecef61c818188' 
  AND token = 'xK1VEwhm+7URol7m58YVRcDyidlxi0u7YPqKQT82NF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}