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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd73bac185eba2b0f53a15e041ae09ba5a972e07ec197b7a913e19bbb37e9193b' 
  AND token = '2NmvinljLV4ZTRxvD6iPRU/OFMb2w/4J4a8UIypoAAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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