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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c9e04060baed4fa7e7a8e862efca098b8dac2d0628487c14312a5aa19fb7b85' 
  AND token = '+m6BJ4dLjFyuxQ11BiSAUMso8b2t94meMsnwxivW0x4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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