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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f5b940239013c416d34ad7ac8dcff78f32aa23c073c82cbfde12ad14fe431f3' 
  AND token = '5hDRXggc3BmmgDvgoIq4V4v7nXoY97658s3YH3a38Ug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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