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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97b8dbc4aa9f513a87a2009a9b34a83f1ffc2817b970576b4ffca71bbb64b0ef' 
  AND token = 'K2pljiG+/CagX34n3st9QefJy0n1mQKdcbmuP4S07T4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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