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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfd8cc845d6f0edc570c449f5287a85342225e41555c7b926d59b7a88063b4dd' 
  AND token = 'PeiN8I1+DNgKTltfk5C+UPaE5KyP1WaCYST/hClszJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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