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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bc92f74fb1fcd9923b5b2d65ebc0f61ac32fbc31ec5095270cef131c8fed917' 
  AND token = '90NRjKsHiDmuNK+mmBK+iYwlIGpz3DVMrnTnOOYcxaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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