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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c63a7e07afa416df6dacade1e6a2972486d340b5dcc3898f68015ef53b38d38' 
  AND token = 'qihS5OagVZ/2spO3ToolD1Zhmcz4yZnDHrdRjSEeRYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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