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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9ec8b32989859be4109aa10db75ecf76fb6a8d6f1bcec14ca95fffc6503b62d' 
  AND token = 'UV6QYpe12rqQXVfFFxpa7NLuRqPYGqlOE3w+vlFx/2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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