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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e79de29075681889a44ee73cd93362ed61dcd5eccbbdf6b34e85ce20ba18d78' 
  AND token = 'ULY1BLVbIAoGgMeNNlzO6ctvs2H+tEMdGzcNuOBpQgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00078

JSON explain

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