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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b4ac2741bd79bdb1aa123dd340ba3f4ed5fa6df33b32874d7ac493aefe345eb' 
  AND token = 's7vxkFzaUx19ERTi+H4uCsuQ/oc8oNBRQ0+1WkeLddU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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