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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df8de9cc54d01586dd7f2412e4ef5185fb1565e09724e817c326bdf25ae4bae5' 
  AND token = 'GE72+rwl9HJAxkbTxnBqteh8Uwbp0m2nFH0QGoBFex8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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