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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7617d7ac0966e2cf5e633f9cc8331a0dc8c7c5177f99af21597d5afd4cdcf98e' 
  AND token = 'fhv81n0jcBLhe7bGhU2BE585MIoZ+JcqrleJw2muIwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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