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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43741322f95e7994a0f0af056ae05d0bcf167ce777425e4c59251fc343803fe5' 
  AND token = '7whzCQ52iJ+J/ptn6kD61uQxgTZrUTNeRnP8QLA27yU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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