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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13d4fc54d30fe11659f3efbb2fb17b23703d1a897447333b7b5601cdf426db9f' 
  AND token = 'Dm19AhXjY784/K1jPPbOXBhet+V5da/7d+F1PTDb7kM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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