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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2cb7bb546e0459edf214d14ee11fe60c0cca4b7cb7b82516e768fc819273c9a' 
  AND token = 'Ds0xzy04LAK26jD8oX8Z7DRfWmq8kCDn8O8lfEGF8BE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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