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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f190ecb615d9d2f4bc936e9423157d2956e4259b2b895cee18ead2a81a135e9e' 
  AND token = 'uL3bjhVSolLRlm9QWVgFDrB6Mc1Jm21jO7ENfaSXSnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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