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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ffd9738d5b0db4a9f3e994d2d096560a65f8602245a1dbab08e52fb643ec05b' 
  AND token = '5zu1N69bxWPXdbl3pKE6NffWsuAc6lTrwNbD/I6262U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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