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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9597e99a828a53e777193b6d126c7dd47d6ec2e732632fa1135a651ec171a9ed' 
  AND token = 'OuOWJ4EfHX4vV7WQvZH4tG46bu7TP/PO8Ll7Yr0g2jw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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