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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d267c3bf3a72e0f0991583ff8cfc728ff00fc471f68d58bccb27a20c78f479a' 
  AND token = 'cBKU/QWywqe1rj2j2kvhNYs4DakfaRNoi20+cof7KtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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