SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6b5422e6187536edb88e7654bde7d8b7cf54d5f1573dc207a388d52a29b3951' 
  AND token = 'FPhIy2sLiGYUEUzIVtIAIY/Y1DTvlVz9dimyFNkrwgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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