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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b301df2d935323d3ccd2b28872fb9098214180dfc8d70339ffa6f65a1629c25e' 
  AND token = 'ZIdxYU80hpr9G+3XshhYEUqlJ/Mw6yMKPd/Lc2ffItw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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