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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8feb33c715239502116b614a5af9a1295f9494682b211c95e1cda15f86ffde38' 
  AND token = 'pUe2M9r9T8M4P4TCf8xfoGF/MBXqJxrLX3JPfoBcT/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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