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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4c186d0cb8a088f56ec026b875b416d8292d8e556ac37a509bd6af14544aa86' 
  AND token = 'E1/N3v/Y5j5hfKrv4Hx5IN42uRW023ZRLbZIlwofC9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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