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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41cfddff6b033c813f44e2fec08777064de27f83370e953c721cc3986ebf669c' 
  AND token = '4jByDiy/jQcLNI/9YYPY30NGyiYyyAqUznUKbJ1f7g0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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