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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '214692a0b90ff04d4b4fb8c88010ce59afbeb92149e52b52e5e0d183a6752be5' 
  AND token = 'dAfJzhT6bmOXWRfqYpQ85Xr3VcwV6N95fASxx2gB5Fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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