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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abb0900d4a50c7968b8a70af6068eeb61256fb1fda9ed38537e2f0cf722ec743' 
  AND token = 'RuQcOYTNSdXUCsoRIS4wCLDokhezoUB3J2ExlKWViHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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