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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27928afbf6ae73ebb4b478525b101ce5e1744df7f05654dfa5e28dab261d06b8' 
  AND token = '6Hd6R2GadaBLduqWNTFKZg8G80d5Se6TlTJKN+lejco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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