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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '867cdb44a33a7fa8032d415a3a847e237dbe4c6e0f17c2f06d267e8db12d7fe2' 
  AND token = 'XJ/C/9WHVtIFuIwJB8xPXqXejF0jfdsEoNkYn7EChvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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