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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eda5b13af667a8b2f7882ad47300d60665025d81ab855f9a8c35e606e683f65a' 
  AND token = 'BFS5jzNBHDRdjkLZ7A2j2SN22CPAVNlpOxCkNzmCoIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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