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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db2f2a170cf4b6edbc6a7ee9d764bf09ab044553e537ce87091af36a155e9c8e' 
  AND token = 'sFfPXRc9J1mxfSFFK2rhLQxPHo/qa0Hq/Uq6RRH1+6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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