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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51498595c5df2cc54f4972c437b354446cac3f2dd00df36487e4d2021b4b56d2' 
  AND token = 'nxvsDuVUpZdQJwZR23SWEtQi5bSE33hwzvZ1bh0tJo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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