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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5cdaeb6bba3eb0a840291f9bd792aa7e894a14ec000cd616c41621e2f1dbda9' 
  AND token = 's12+uwp122/5tMHw99R2PqGbxDd8uwRbHCvyL3Gwqgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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