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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d2ce2ba2667a237cecf29bb6914ff5280884e4d11f3cc291289b85af9373acb' 
  AND token = 'ywfZfc4bNqiStOMK55jmAr4xFbgiCO9gYswNcTTuJ4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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