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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d7656ecf556126d5370b69a749f2fc3392b7251ce5936527e0ef7801093bce3' 
  AND token = 'KHzzSF6zIlBfjYRxg6ucTYyZ7Cd3MuAVw7EYqcXAjbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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