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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d28466ef930b8bd747de89ba3f88d620afd267d8f6db634e7d2ac92afa2c878' 
  AND token = 'cyXdnJ5ljQbhGcHpLaE/ipAsj/lZD7qO6U4bHqj/FfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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