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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb017072b0e05efc89a26ab709b7f483b8fc1609b7de1f44bb303d71ac9482e6' 
  AND token = 'Fnvgz49wh0JsRBHLhd1xErr33+KXclMCptBb/f/MfOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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