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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c5de5e925564184473b5eafe45254630dbc1ee3f11a6403b8c8b555e2b38716' 
  AND token = 'T+Yx/N44oCAmpKX4WTEIaPCE3puka9pMi8xfwv2Pzt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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