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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b69bad96825a8a9508e0d6f6197a33a93ca1d1715702fa2ce6e5df5c599076fd' 
  AND token = 'G5OuC8TbFn2n35IwjKUh1dPSrwQ2dSvud2I1et9rpxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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