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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '713c3a564eda3df950bdfffd2b3a224c5f11655539f7a34b40813339bb1fa019' 
  AND token = 'VdEaqxmz8kTms2BHZNAJvmaTtKK/eTWvZrje2DbCcHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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