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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '403cd66dbe13768536da205d02caf2dc9a5064380227cbb20bafcfe99fbc76b7' 
  AND token = 'osTpdI7f80+AVfCFT5elKUZaiZ7hDWPEJ2yotvlJDA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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