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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1f85242abd8c3ba89fef84fc6a8cbbba97389de3b0fea8e311a537271d19172' 
  AND token = '3O1YYPd26FgS1LsYpOtWHNdLmhW0qgC9a+B5K0K9tYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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