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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd58aaf0e2600e77b236f84fa73f0279dabfaf80723e71732f8758a22c903d58f' 
  AND token = 'h4xEwWkivRQmy+dWp2M4Af7BEIAs0KGU8uYjpWEpzaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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