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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '794828addd9d09894b1c2d5d47d9ec05124eeee444ce955573356386b71a358b' 
  AND token = 'BHVgEvRivdQYaeaZi/DYwLzIcLrfb9ddFpcz6swycg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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