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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1982e8ba944265e3854775bd485b75beeb0227a801fdd0e45512cd44c67934ee' 
  AND token = 'C25k+27PrHNuHZw1+PDpjo3FtmvUE5ve6ENc6thBGvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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