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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21642fd1055bb8cff1b4aefba65755ab21f4c1ed3086cea932d258daec7e9b88' 
  AND token = 'yFvrpUv3ANp0GGBcxuvHVpf5JGC2tVApNbIyzm/4Zyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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