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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '821fad87ef3bd744962a1e4a6aa489bbe3d5d787022bd379dffd27dd1d71b9fa' 
  AND token = 'zltH+P+HzuwxzDW6mrZrZd9xRU34OUfWwba5RHdqIB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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