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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58471a323dbde58b6b6eb90ddf98df5a80218073f37a463e545b6e15cef9dcac' 
  AND token = 't5QsRsbbqsxZIT/p1jE50w9wBP+51F7zFQbkNoQk/Qc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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