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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc6b544a3af3c9a97a8881ad8b5e569a2230dda7663005aee31dac94fbd388a5' 
  AND token = 'lWSLZjAHOzEuDu3RYc+bGRej43EE7tz0nBx4rxGbVO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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