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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf5f0990572a16ada18fc7c35524cb332ff8509cf0dcdde4fbab6b1cc578c425' 
  AND token = 'tgwBeNQkezyekLlGQfsf5xz358Pq8+5Ocg+SR7DArFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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