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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '138c7535443e84b8a4d873a0fd6bbfaeec88a01b26fe951cae6b101701ee2295' 
  AND token = '3RoF6VSwgD3CMtgTBgftzFH3zTcHq1wEDG58b036VPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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