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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04cf3f17408ae6b0cbe5636b2d33cedefe9f4058e230415e0fa7798a5c6a8aea' 
  AND token = 'HPITCd2p+g5dUzT8f43sCkCTdfm1ZWz6nWZlHG0EUnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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