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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b05f6e48a25a95ab6710e41e6d77b8c54a203657c82f27ee22703be5833d3ce' 
  AND token = 'TL9my4fEMD1xsuJCDHD0ISZLd0Sn+IUcv1J66OSej3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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