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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a692e94db3f10f0a1e64b790b259096c699df56b87ce9676fe32a2c45b83dfc' 
  AND token = 'NE465+m2NAtFynyG9oS6PV01NpulwAAc16P+m09Hm28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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