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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1b63ab37c54147142e0de642e3b0a65fae0e6a8b970af8c6126b79bc1b69849' 
  AND token = '93UPRgeJwdfiq7ixdIw5udiB+pMvJSzld9FF7wTvqW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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