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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb0b3b1b787e0701172788be3dc50a59ce13fdde97f72ba8c1466c405a989adf' 
  AND token = 'XwW/9SiWRARLs07ajnadC/2AuCYt/TWp5Ybeh5lX9O8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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