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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cca7a1cd87c3730879fb4e6ab335ae46f0059ed3d355e4af85f7cc898097b1da' 
  AND token = 'gxeFq/h7pfFsvPyKEcRzeaZ7FRVf3hOnga0/rAHYRxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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