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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a5c82fef937b8464b2a87f385b60518c19d7861375bbb61f55c784b2f6660dd' 
  AND token = 'uOYRA1h95HyWdN3niRoyaq6WQRDaprtqSm0SMyIdUjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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