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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32653fc60afb6ec061643ac7ed9085f79211e53dc5a725aecb46ac2c10dabd1f' 
  AND token = 'lFLknR7hOSvdpWdwyXGbZ28ZUxblyafxXkX1Aa36Fyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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