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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5441b7b8bf4113372575e00ad7ecf3c5588353b74457f2b14408e4ba73e4b1c3' 
  AND token = '1ZwIeEf6t7C3JKrztDlu/o+deAw2e1h3fU97tn3LYL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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