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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28d8be1c8e0f30bf0ba3abb75004160faa362858dcd8da4945daf002bd2d2580' 
  AND token = 'huroZ7L/YsBGo7Wkl+WZls2g71Jp/C4weE5O1op6gss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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