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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2dcde23150f13a49ced26e1702159969a3b32d37ced92a96eebaffff56b6b0e' 
  AND token = 'Tjn1Er0cODnJR+9tUMzfs3Fm0iLTt9H0FEJydHGeVkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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