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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d721c030bd76ab90caa4417d61eeb87c94ac031212b85c653f6ae07e3db6b36' 
  AND token = 'HACduVoMpaw8dPv66ksNcf4ltie+QwjHK262KGWuIjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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