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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c820555f0a05ee7f4648361e6b8a0dbb8da3189e5ae82c4944b71b881e1c824d' 
  AND token = 'iJ38Whye/ckkFSvBdF6jJ1EVi0CKe5PHbyHhAQrOCCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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