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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '417734af3a649b66dc449b860ef21f95a441a23879751b22ca84cdd12fac5ecd' 
  AND token = 'k5084uU9cq30U9YoUZAw6lGRQAaTUWM7c6kiQyxWSk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00159

JSON explain

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