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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82caea79d49d8542c99098933f1b1e7ba05c0fa8a6e4c68e1c989f6ccbff718e' 
  AND token = 'FEmHfaFuNbRBcAcs6Mi/jL+gYwhZZr5ca8rsXAlcrf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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