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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c2925455a83db61ae6ce517d28df287ddc43157fcbd6ca94857ef80e4efb989' 
  AND token = 'WRP4usrWGeFO39//9siMy5B0GU2rLauhTJpavLRCwKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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