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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35554bb1e0b8a9ffa1939e932b986f8239432f5534b13ceca514bbf0209cf869' 
  AND token = 'diDOgzlDzyuUgK1Lz9Jfp2Sww2a5KF4QDyUEOe1qz1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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