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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34412254fe99bcedcdfec9a1fac239ae44aa132cffa6d93b293e4ea206e8d27f' 
  AND token = 'awc5grg49b4Cb3ymsNNIrU7S8k9+6DIYgRwdjeaF/GU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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