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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51565f473c18e720e358d49d1c15490f1b7ed9f31b38bb4d8ae304ea8f15a28a' 
  AND token = '/a+7uPzk6Av1fxWGq0Zxo2Q5ttTV5/cNbkTa5x/ho+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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